Charging System Check

[shenning]

I have a '99 GP GT, 3.8L. I suspect that my alternator is bad, as the battery indicator is on. Also, some other indicators (ABS, TRAC Off, etc.) come on intermittently. Does anyone have a reasonably easy way to test the charging system to try and determine the location of the problem?

Thanks!

[richtazz]

Welcome to AF!

I moved your post from the tips and maintenance section to the main forums for visibility.

A voltage test with a DMM will give you a starting point. With the car off, the battery should have between 12.6 and 13.2 volts, and with the car running, it should read 13.8-15.2 volts. You can also do a visual inspection of the battery and cables. Take the cables off the battery and check for corrosion, as well as for leaking or loose side-posts on the battery (a fairly common issue on side-post batteries).

Other than the battery indicator, another cause of electrical gremlins on these cars is the ignition switch/harness assembly. The contacts get weak and arc, causing many electrical gremlins (DIC issues, blower speed issues, interior lighting problems, etc...). I don't think this is your issue though, due to the battery light being on.

[shenning]

Thanks for the suggestions. I'll give it a try.

[shenning]

Just wanted to post a follow up on my earlier message. It turns out that the alternator was bad. It's replaced now and running great. Thanks again for the suggestions.